Hi Vadim, Hi All
As far as your modified model is concerned, I've made only few changes
( wall's thickness: no change).
Please open the component library(SU Window menu) ( small house) , you'll see your windows treated as component. The benefit of such a way : changes are applied to all instances of this component wherever they are located : time saver.
Try also to open Outliner(SU Window menu), you'll see the structure of your model, it's quite convenient for focusing on one group (even if hidden ). You can organize your model like a tree, branches etc... you can even decide to move an group inside an other one easily just moving the named group instead of opening group, subgroup ...
MALAISE 


MALAISE
when more than half of humanity is starving....

MALAISE